Chair and desk attachment.



T. E. McNULTY.

CHAIR AND, DESK. ATTACHMENT.

APPLICATION FILED MAY 12. 1916.

1,291,975. 1 Patent-ed Jan. 21,1919

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morass n. IdcNULTY, or rnsncisco, cannot l CHAIR AND DESK ilT'ilACHliZENT.

ma l-w Specification of Letters Patent.

Application filed may 12, 1916. Serial H'o. 57,115.

This invention relates to detachable chair or desk attachment, the object of the invention being to convert the ordinary chair or school desk back into one hygienic and anatomically correct.

While notlimited to school or desk use the invention is especially suited for use in correcting" defects now'found in the usual type of desk hacks provided for use in pub lie and private schools. A careful eriamination has disclosed the fact that by reason of the present seating methods employed many pupils have contracted various spinal troubles that impair their health and also interfere with their studies, and which may in many cases account {or the apparent backwardness of some pupils.

This diiiiculty usually comes from the use of seats that are provided with a concaved shoulder panel of greater width than the shoulders of the pupil using it, andin some cases with a back higher than the top of the shoulders.

This would cause a pronounced case of weak spine in time as the spine is not supported in the movements of the shoulder in the numerous positions that are required in the course of study.

Or the chair may be of the straight back type with a distinct leanback so that when it supports the hack of the pupil the weight of the body forces the hips and legs forward causing a diagonal strain on the spine. which curves in an outward position. causing in time spinal and other troubles.

My invention is designed to correct these objections without making it necessary to replace the present school furniture.

' I have illustrated my invention as applied to the back of a school desk of the ordinary construction. and in the drawings:

c Figure 1 is a perspective View of a desk with mv attachment in position thereon.

Fig. 2 is a vertical section through the desk back, my attachment being partly in side elevation and in part in section, on the line 2-2 of Fig. 1.

Fig. 3 is perspective view of a bracket. Fig. 4 is a perspective view of a metal her.

Fig. 5 is a Fig. 2. Y I

In the drawings 1 represents a desk having a back 2. i

A metal bracket 3, preferably though not necessarily iii the form of a channel bar, has its upper end portion bent at a right angle as at l and then bent downwardly as at Midway or thereabout the bracket is formed with a slight obtuse angle 6, the upsection on the line 5-5 of per portion extending slightly downwardly chair back, at top and bottom.

Crosspieccsl), formed of wood, rounded on the top and bottom edges and of suitable width are channeled transversely on their rear faces as at 10. and set into said channels are flat bars 11, their exposed face; being flush with the rear face of the cross pieces. These bars are of greater length than the width of the crosspieccs and project above and below them. At their upper ends they are provided with a hook member 22 in the shape of a cylindrical lug extending at an angle from the end of the bar. In the bars are also provided openings 13 through which securing devices in the form of screws and bolts may be passed.

The pieces 9 are secured in place across the brackets 3 by engaging the lugs 12 of the bars 11 with proper openings 8 and are locked by bolts 15 which through o her openings 8 and through one of the spot-line's 13 of each bar. Screws 1-: are employed to secure the bars 11 to the crosspieces 9.

It will be noted that there is a slight difi'erence in the cross sectional shape of the crosspieccs, the lower one being thinner at m the same file Rowe]? eeige. Thie efififerenee eem'b'med v-rlth the sh ht angle glve'e the brackets at he peim 6 gives a d Herenee in inelfinetien or 131m t0 the er-ossyieces, favoring the corree'i' shape anei eurvatuzge 01 the s ine.

In a correct siteing posture the ee-51y muse h e free movement in i members, anei eweei'amente should be fiited $0 each desk eeeemmodete the pupil using it, so *ehert he W111 have free sheulder eml abdomen LC'Jiifill. 4

1 he HIQPEY Q'i'OSSlOiQCG should be set siighi y eel-aw the saeulder blades, the lower eel-use the n wis, approximately at right angles wifil: e filighfi, and with she feet squarely on 'fue flee: the result Wi'ii be square shoulders and erect ehee position, The ac? iusiab'iiiey m? the eresspieces with Yeference t0 eeeh eiiher essential as there is diffeeenee lengih sf curve, m: spine in pupiis teal height;

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